From patchwork Fri Jan 18 10:06:23 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurentiu Tudor X-Patchwork-Id: 10769655 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 850C913B4 for ; Fri, 18 Jan 2019 10:07:09 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 722532A55C for ; Fri, 18 Jan 2019 10:07:09 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 65F552E891; Fri, 18 Jan 2019 10:07:09 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-5.2 required=2.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,MAILING_LIST_MULTI,RCVD_IN_DNSWL_MED autolearn=unavailable version=3.3.1 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.wl.linuxfoundation.org (Postfix) with ESMTPS id DB94F2A55C for ; Fri, 18 Jan 2019 10:07:08 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20170209; h=Sender: Content-Transfer-Encoding:Content-Type:MIME-Version:Cc:List-Subscribe: List-Help:List-Post:List-Archive:List-Unsubscribe:List-Id:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:In-Reply-To: References:List-Owner; bh=W88Z3yBm3Y0vGNfzWo4ZQY6ptXM4+9hrZrGJuB+6cTc=; b=YmS QHLDYaVRYjUJOAVQcsfFR8BEH5HfY5f+xGJlftdJ06v42tZr/wJKymIez4dLWr/Yut6664AMtcFIH np7bxspKP+1Z/OXV0uD3CTvQLDG6qwcIv1zAv211+98e813Rf+9X4IC7McvZBMmIH+9OQZwiIpaEA P/WpXGuWwjmtzuCIew3B8ecFvqXorhtijywh+v6nIF5BXuE0E4UuFaT241ize8HwdYYG9yNAZqK0h +DlPWX9hdbBr4jGbLX7/E22fLGvEoSuBpe8AJDuo7OBbtGeopZyUhncyt9PgORgaf+qZhP941NN5r Vo/SNM21YQaJ+rpe2PT5YZTJnhKIZtg==; Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.90_1 #2 (Red Hat Linux)) id 1gkR3K-0006aT-IZ; Fri, 18 Jan 2019 10:07:06 +0000 Received: from inva020.nxp.com ([92.121.34.13]) by bombadil.infradead.org with esmtps (Exim 4.90_1 #2 (Red Hat Linux)) id 1gkR3G-0006Ze-At for linux-arm-kernel@lists.infradead.org; Fri, 18 Jan 2019 10:07:04 +0000 Received: from inva020.nxp.com (localhost [127.0.0.1]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id E263A1A0289; Fri, 18 Jan 2019 11:06:58 +0100 (CET) Received: from inva024.eu-rdc02.nxp.com (inva024.eu-rdc02.nxp.com [134.27.226.22]) by inva020.eu-rdc02.nxp.com (Postfix) with ESMTP id D32561A0286; Fri, 18 Jan 2019 11:06:58 +0100 (CET) Received: from fsr-ub1864-101.ea.freescale.net (fsr-ub1864-101.ea.freescale.net [10.171.82.46]) by inva024.eu-rdc02.nxp.com (Postfix) with ESMTP id 6EF26205DB; Fri, 18 Jan 2019 11:06:58 +0100 (CET) From: Laurentiu Tudor To: vkoul@kernel.org, dmaengine@vger.kernel.org, linux-imx@nxp.com Subject: [PATCH] dmaengine: fsl-edma: dma map slave device address Date: Fri, 18 Jan 2019 12:06:23 +0200 Message-Id: <20190118100623.13271-1-laurentiu.tudor@nxp.com> X-Mailer: git-send-email 2.17.1 X-Virus-Scanned: ClamAV using ClamSMTP X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190118_020702_704207_F24AA036 X-CRM114-Status: GOOD ( 13.00 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: iommu@lists.linux-foundation.org, robin.murphy@arm.com, linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, Laurentiu Tudor MIME-Version: 1.0 Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+patchwork-linux-arm=patchwork.kernel.org@lists.infradead.org X-Virus-Scanned: ClamAV using ClamSMTP This mapping needs to be created in order for slave dma transfers to work on systems with SMMU. The implementation mostly mimics the one in pl330 dma driver, authored by Robin Murphy. Signed-off-by: Laurentiu Tudor Suggested-by: Robin Murphy Tested-by: Angelo Dureghello --- Original approach was to add the missing mappings in the i2c client driver, see here for discussion: https://patchwork.ozlabs.org/patch/1026013/ drivers/dma/fsl-edma-common.c | 66 ++++++++++++++++++++++++++++++++--- drivers/dma/fsl-edma-common.h | 4 +++ drivers/dma/fsl-edma.c | 1 + drivers/dma/mcf-edma.c | 1 + 4 files changed, 68 insertions(+), 4 deletions(-) diff --git a/drivers/dma/fsl-edma-common.c b/drivers/dma/fsl-edma-common.c index 8876c4c1bb2c..0e95ee24b6d4 100644 --- a/drivers/dma/fsl-edma-common.c +++ b/drivers/dma/fsl-edma-common.c @@ -6,6 +6,7 @@ #include #include #include +#include #include "fsl-edma-common.h" @@ -173,12 +174,62 @@ int fsl_edma_resume(struct dma_chan *chan) } EXPORT_SYMBOL_GPL(fsl_edma_resume); +static void fsl_edma_unprep_slave_dma(struct fsl_edma_chan *fsl_chan) +{ + if (fsl_chan->dma_dir != DMA_NONE) + dma_unmap_resource(fsl_chan->vchan.chan.device->dev, + fsl_chan->dma_dev_addr, + fsl_chan->dma_dev_size, + fsl_chan->dma_dir, 0); + fsl_chan->dma_dir = DMA_NONE; +} + +static bool fsl_edma_prep_slave_dma(struct fsl_edma_chan *fsl_chan, + enum dma_transfer_direction dir) +{ + struct device *dev = fsl_chan->vchan.chan.device->dev; + enum dma_data_direction dma_dir; + phys_addr_t addr = 0; + u32 size = 0; + + switch (dir) { + case DMA_MEM_TO_DEV: + dma_dir = DMA_FROM_DEVICE; + addr = fsl_chan->cfg.dst_addr; + size = fsl_chan->cfg.dst_maxburst; + break; + case DMA_DEV_TO_MEM: + dma_dir = DMA_TO_DEVICE; + addr = fsl_chan->cfg.src_addr; + size = fsl_chan->cfg.src_maxburst; + break; + default: + dma_dir = DMA_NONE; + break; + } + + /* Already mapped for this config? */ + if (fsl_chan->dma_dir == dma_dir) + return true; + + fsl_edma_unprep_slave_dma(fsl_chan); + + fsl_chan->dma_dev_addr = dma_map_resource(dev, addr, size, dma_dir, 0); + if (dma_mapping_error(dev, fsl_chan->dma_dev_addr)) + return false; + fsl_chan->dma_dev_size = size; + fsl_chan->dma_dir = dma_dir; + + return true; +} + int fsl_edma_slave_config(struct dma_chan *chan, struct dma_slave_config *cfg) { struct fsl_edma_chan *fsl_chan = to_fsl_edma_chan(chan); memcpy(&fsl_chan->cfg, cfg, sizeof(*cfg)); + fsl_edma_unprep_slave_dma(fsl_chan); return 0; } @@ -378,6 +429,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic( if (!is_slave_direction(direction)) return NULL; + if (!fsl_edma_prep_slave_dma(fsl_chan, direction)) + return NULL; + sg_len = buf_len / period_len; fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); if (!fsl_desc) @@ -409,11 +463,11 @@ struct dma_async_tx_descriptor *fsl_edma_prep_dma_cyclic( if (direction == DMA_MEM_TO_DEV) { src_addr = dma_buf_next; - dst_addr = fsl_chan->cfg.dst_addr; + dst_addr = fsl_chan->dma_dev_addr; soff = fsl_chan->cfg.dst_addr_width; doff = 0; } else { - src_addr = fsl_chan->cfg.src_addr; + src_addr = fsl_chan->dma_dev_addr; dst_addr = dma_buf_next; soff = 0; doff = fsl_chan->cfg.src_addr_width; @@ -444,6 +498,9 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( if (!is_slave_direction(direction)) return NULL; + if (!fsl_edma_prep_slave_dma(fsl_chan, direction)) + return NULL; + fsl_desc = fsl_edma_alloc_desc(fsl_chan, sg_len); if (!fsl_desc) return NULL; @@ -468,11 +525,11 @@ struct dma_async_tx_descriptor *fsl_edma_prep_slave_sg( if (direction == DMA_MEM_TO_DEV) { src_addr = sg_dma_address(sg); - dst_addr = fsl_chan->cfg.dst_addr; + dst_addr = fsl_chan->dma_dev_addr; soff = fsl_chan->cfg.dst_addr_width; doff = 0; } else { - src_addr = fsl_chan->cfg.src_addr; + src_addr = fsl_chan->dma_dev_addr; dst_addr = sg_dma_address(sg); soff = 0; doff = fsl_chan->cfg.src_addr_width; @@ -555,6 +612,7 @@ void fsl_edma_free_chan_resources(struct dma_chan *chan) fsl_edma_chan_mux(fsl_chan, 0, false); fsl_chan->edesc = NULL; vchan_get_all_descriptors(&fsl_chan->vchan, &head); + fsl_edma_unprep_slave_dma(fsl_chan); spin_unlock_irqrestore(&fsl_chan->vchan.lock, flags); vchan_dma_desc_free_list(&fsl_chan->vchan, &head); diff --git a/drivers/dma/fsl-edma-common.h b/drivers/dma/fsl-edma-common.h index 8917e8865959..b435d8e1e3a1 100644 --- a/drivers/dma/fsl-edma-common.h +++ b/drivers/dma/fsl-edma-common.h @@ -6,6 +6,7 @@ #ifndef _FSL_EDMA_COMMON_H_ #define _FSL_EDMA_COMMON_H_ +#include #include "virt-dma.h" #define EDMA_CR_EDBG BIT(1) @@ -120,6 +121,9 @@ struct fsl_edma_chan { struct dma_slave_config cfg; u32 attr; struct dma_pool *tcd_pool; + dma_addr_t dma_dev_addr; + u32 dma_dev_size; + enum dma_data_direction dma_dir; }; struct fsl_edma_desc { diff --git a/drivers/dma/fsl-edma.c b/drivers/dma/fsl-edma.c index 34d70112fcc9..75e8a7ba3a22 100644 --- a/drivers/dma/fsl-edma.c +++ b/drivers/dma/fsl-edma.c @@ -254,6 +254,7 @@ static int fsl_edma_probe(struct platform_device *pdev) fsl_chan->pm_state = RUNNING; fsl_chan->slave_id = 0; fsl_chan->idle = true; + fsl_chan->dma_dir = DMA_NONE; fsl_chan->vchan.desc_free = fsl_edma_free_desc; vchan_init(&fsl_chan->vchan, &fsl_edma->dma_dev); diff --git a/drivers/dma/mcf-edma.c b/drivers/dma/mcf-edma.c index 5de1b07eddff..7de54b2fafdb 100644 --- a/drivers/dma/mcf-edma.c +++ b/drivers/dma/mcf-edma.c @@ -214,6 +214,7 @@ static int mcf_edma_probe(struct platform_device *pdev) mcf_chan->edma = mcf_edma; mcf_chan->slave_id = i; mcf_chan->idle = true; + mcf_chan->dma_dir = DMA_NONE; mcf_chan->vchan.desc_free = fsl_edma_free_desc; vchan_init(&mcf_chan->vchan, &mcf_edma->dma_dev); iowrite32(0x0, ®s->tcd[i].csr);